Malicious PDF — malware analysis report

Static analysis result for SHA-256 781684ad4af33c4e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 02:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c383219532edf8fefa3043ecd5f4c74a SHA-1: ebdc0bb28fb2083b23ab5469d2c363104e5ff152 SHA-256: 781684ad4af33c4e8646a4efe2b7056580bc95c01eb0e579a1b8efb27e27e452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.mezmat.ru/ckfinder/userfiles/files/38907790004.pdf In PDF document text
    • https://denizlihorozu.com/resimler/files/budiwixasezipomizun.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/dusedotilegesotoj.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/kivilavufegosilotinur.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/tavesugowutusa.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/wasuj.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/pagepukarodidi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b726253---90166105161.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/18354616260.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbf59d05b---31654880181.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/rexipokofekepetuzus.pdfIn PDF document text
    • http://bwawarszawa.pl/upload/file/xoxenibisuxo.pdfIn PDF document text
    • http://888chji.com/userfiles/files/kilegokezemazojij.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4596ac38d5ed0b0f50ac0f469bb56e7c/rimanikamadadevomesen.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/vifezamosuvutabilolabajo.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/60887374072.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210817_025427.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/wakifelaxodubunu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/23034762684.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/besakexajebazivawanod.pdfIn PDF document text
    • http://namngonviet.com/user-/files/78330787983.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/87372479655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=workouts+in+intermediate+microeconomics+varian+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 17328 bytes
SHA-256: d1b26fbd5dc1e5a0e04c5454962e15a60a305e9abb75ea1e77e9a38843dcac81
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 10984 bytes
SHA-256: dbfd1656006d8494e07ed562794a6044d3d9df088553cfa308f6d955c4fc01e6
font_02_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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